The Spanish surname Aguilar is an habitational name from any of numerous places called Aguilar, from the Latin term  aquilare meaning “haunt of eagles,” for example Aguilar de Campo in Palencia, Aguilar de la Frontera in Córdoba, and Aguilar de Segarra in Catalonia. The first recorded spelling of the family namein the New World was Luis Aguilar, which was dated August 24th 1661, in the registers of the city of Asuncion, Mexico, during the reign of King Philip IV of Spain and Emperor of Mexico, 1619 - 1665. Today there are approximately 125,000 bearers of the surname Aguilar living in The United States.